1 /*-
2 * Copyright (c) 2005 Stanislav Sedov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: stable/9/sys/geom/label/g_label_reiserfs.c 199875 2009-11-28 11:57:43Z trasz $");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34
35 #include <geom/geom.h>
36 #include <geom/label/g_label.h>
37
38 #define REISERFS_NEW_DISK_OFFSET 64 * 1024
39 #define REISERFS_OLD_DISK_OFFSET 8 * 1024
40 #define REISERFS_SUPER_MAGIC "ReIsEr"
41
42 typedef struct reiserfs_sb {
43 uint8_t fake1[52];
44 char s_magic[10];
45 uint8_t fake2[10];
46 uint16_t s_version;
47 uint8_t fake3[26];
48 char s_volume_name[16];
49 } reiserfs_sb_t;
50
51 static reiserfs_sb_t *
g_label_reiserfs_read_super(struct g_consumer * cp,off_t offset)52 g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset)
53 {
54 reiserfs_sb_t *fs;
55 u_int secsize;
56
57 secsize = cp->provider->sectorsize;
58
59 if ((offset % secsize) != 0)
60 return (NULL);
61
62 fs = (reiserfs_sb_t *)g_read_data(cp, offset, secsize, NULL);
63 if (fs == NULL)
64 return (NULL);
65
66 if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC,
67 strlen(REISERFS_SUPER_MAGIC)) != 0) {
68 g_free(fs);
69 return (NULL);
70 }
71
72 return (fs);
73 }
74
75 static void
g_label_reiserfs_taste(struct g_consumer * cp,char * label,size_t size)76 g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size)
77 {
78 struct g_provider *pp;
79 reiserfs_sb_t *fs;
80
81 g_topology_assert_not();
82 pp = cp->provider;
83 label[0] = '\0';
84
85 /* Try old format */
86 fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET);
87 if (fs == NULL) {
88 /* Try new format */
89 fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET);
90 }
91 if (fs == NULL)
92 return;
93
94 /* Check version */
95 if (fs->s_version == 2) {
96 G_LABEL_DEBUG(1, "reiserfs file system detected on %s.",
97 pp->name);
98 } else {
99 goto exit_free;
100 }
101
102 /* Check for volume label */
103 if (fs->s_volume_name[0] == '\0')
104 goto exit_free;
105
106 /* Terminate label */
107 fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
108 strlcpy(label, fs->s_volume_name, size);
109
110 exit_free:
111 g_free(fs);
112 }
113
114 struct g_label_desc g_label_reiserfs = {
115 .ld_taste = g_label_reiserfs_taste,
116 .ld_dir = "reiserfs",
117 .ld_enabled = 1
118 };
119
120 G_LABEL_INIT(reiserfs, g_label_reiserfs, "Create device nodes for REISERFS volumes");
121